Yes personally I think optical scan ballots are probably the best solution for both worlds. They're basically counted as the votes are given by the machine and

Yes personally I think optical scan ballots are probably the best solution for both worlds. They're basically counted as the votes are given by the machine and provide a full paper trail that can be fully audited later. They do have some problems with people incorrectly marking the sheet (eg not filling in the bubble fully). They can break down which is a little troublesome but the votes can still be tallied by alternate means.